There have been tons of reports of people getting banned for using the following software on PC:
Game Capture Mode in:
OBS
XSPLIT
Overlays in:
Fraps
Mumble
Discord
Hardware monitoring Software:
MSI Afterburner
EVGA Precision XOC
If these software's are running, you will get banned.https://www.bungie.net/en/Help/Article/46101
Edit: Or any other software that has code injection.
Edit 2:
According to the latest information from Bunjie, ALL BANS ARE PERMANENT. You cannot dispute your claim either according to the link below dated 10/23/2017.https://www.bungie.net/en/Help/Article/11929